UWorld Endocrine Practice Test 2026 – Full Preparation Resource

Cortisol is a glucocorticoid hormone produced by the adrenal cortex, and it plays a crucial role in the body, particularly in regulating metabolic processes and the stress response. During periods of stress, cortisol is released to help the body manage and adapt to stressors by influencing several physiological functions.

One of its primary roles in metabolic regulation includes promoting gluconeogenesis in the liver, which is the process of generating glucose from non-carbohydrate sources, thereby increasing blood sugar levels. This is essential during stress or fasting when the body needs a quick source of energy to respond to potential threats or maintain homeostasis.

Additionally, cortisol affects protein and fat metabolism by promoting protein breakdown and lipolysis, which aids in the mobilization of energy reserves. Its role in the stress response is significant, as it helps to prepare the body for a 'fight or flight' reaction by ensuring that adequate energy substrates are available.

In contrast, enhancing insulin sensitivity, stimulating beta cell function in the pancreas, and roles that downplay cortisol's significance in metabolism do not align with its established functions. While insulin sensitivity is more closely associated with insulin and other hormones like leptin, cortisol acts more as a counter-regulatory hormone, often opposing insulin's effects on glucose